[ALSA] oxygen: save register writes

Save the written values of all CMI8788 and AC97 registers and of some of
the DAC/ADC registers so that it is possible to restore the register
state later.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 14 insertions, 3 deletions

diff --git a/sound/pci/oxygen/oxygen.c b/sound/pci/oxygen/oxygen.c
index c1b30cc75935..8287ac28fe78 100644
--- a/sound/pci/oxygen/oxygen.c
+++ b/sound/pci/oxygen/oxygen.c
@@ -80,6 +80,7 @@ MODULE_DEVICE_TABLE(pci, oxygen_ids);
 
 struct generic_data {
         u8 ak4396_ctl2;
+        u16 saved_wm8785_registers[2];
 };
 
 static void ak4396_write(struct oxygen *chip, unsigned int codec,
@@ -99,12 +100,16 @@ static void ak4396_write(struct oxygen *chip, unsigned int codec,
 
 static void wm8785_write(struct oxygen *chip, u8 reg, unsigned int value)
 {
+        struct generic_data *data = chip->model_data;
+
         oxygen_write_spi(chip, OXYGEN_SPI_TRIGGER |
                          OXYGEN_SPI_DATA_LENGTH_2 |
                          OXYGEN_SPI_CLOCK_160 |
                          (3 << OXYGEN_SPI_CODEC_SHIFT) |
                          OXYGEN_SPI_CEN_LATCH_CLOCK_LO,
                          (reg << 9) | value);
+        if (reg < ARRAY_SIZE(data->saved_wm8785_registers))
+                data->saved_wm8785_registers[reg] = value;
 }
 
 static void ak4396_init(struct oxygen *chip)
@@ -135,10 +140,16 @@ static void ak5385_init(struct oxygen *chip)
 
 static void wm8785_init(struct oxygen *chip)
 {
+        struct generic_data *data = chip->model_data;
+
+        data->saved_wm8785_registers[0] = WM8785_MCR_SLAVE |
+                WM8785_OSR_SINGLE | WM8785_FORMAT_LJUST;
+        data->saved_wm8785_registers[1] = WM8785_WL_24;
+
         wm8785_write(chip, WM8785_R7, 0);
-        wm8785_write(chip, WM8785_R0, WM8785_MCR_SLAVE |
-                     WM8785_OSR_SINGLE | WM8785_FORMAT_LJUST);
-        wm8785_write(chip, WM8785_R1, WM8785_WL_24);
+        wm8785_write(chip, WM8785_R0, data->saved_wm8785_registers[0]);
+        wm8785_write(chip, WM8785_R1, data->saved_wm8785_registers[1]);
+
         snd_component_add(chip->card, "WM8785");
 }